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bevy/docs/plugins_guidelines.md
Carter Anderson e167a1d9cf Relicense Bevy under the dual MIT or Apache-2.0 license (#2509) 
This relicenses Bevy under the dual MIT or Apache-2.0 license. For rationale, see #2373.

* Changes the LICENSE file to describe the dual license. Moved the MIT license to docs/LICENSE-MIT. Added the Apache-2.0 license to docs/LICENSE-APACHE. I opted for this approach over dumping both license files at the root (the more common approach) for a number of reasons:
  * Github links to the "first" license file (LICENSE-APACHE) in its license links (you can see this in the wgpu and rust-analyzer repos). People clicking these links might erroneously think that the apache license is the only option. Rust and Amethyst both use COPYRIGHT or COPYING files to solve this problem, but this creates more file noise (if you do everything at the root) and the naming feels way less intuitive. 
  * People have a reflex to look for a LICENSE file. By providing a single license file at the root, we make it easy for them to understand our licensing approach. 
  * I like keeping the root clean and noise free
  * There is precedent for putting the apache and mit license text in sub folders (amethyst) 
* Removed the `Copyright (c) 2020 Carter Anderson` copyright notice from the MIT license. I don't care about this attribution, it might make license compliance more difficult in some cases, and it didn't properly attribute other contributors. We shoudn't replace it with something like "Copyright (c) 2021 Bevy Contributors" because "Bevy Contributors" is not a legal entity. Instead, we just won't include the copyright line (which has precedent ... Rust also uses this approach).
* Updates crates to use the new "MIT OR Apache-2.0" license value
* Removes the old legion-transform license file from bevy_transform. bevy_transform has been its own, fully custom implementation for a long time and that license no longer applies.
* Added a License section to the main readme
* Updated our Bevy Plugin licensing guidelines.

As a follow-up we should update the website to properly describe the new license.

Closes #2373
2021-07-23 21:11:51 +00:00

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Third Party Plugin Guidelines

Bevy has a plug and play architecture, where you can easily add plugins for new features, or replace built-in plugins with your own.

This document targets plugin authors.

Checklist

Naming

You are free to use a bevy_xxx name for your plugin, but please be reasonable. If you are about to claim a generic name like bevy_animation, bevy_color, or bevy_editor, please ask first. The rationale is explained here.

Promotion

You can promote your plugin in Bevy's communities:

Bevy Version Supported

Indicating which version of your plugin works with which version of Bevy can be helpful for your users. Some of your users may be using an older version of Bevy for any number of reasons. You can help them find which version of your plugin they should use. This can be shown as a simple table in your readme with each version of Bevy and the corresponding compatible version of your plugin.

bevy bevy_awesome_plugin
0.4 0.3
0.3 0.1

Bevy Features

You should disable Bevy features that you don't use. This is because with Cargo, features are additive. Features that are enabled for Bevy in your plugin can't be disabled by someone using your plugin. You can find the list of features here.

bevy = { version = "0.4", default-features = false, features = ["..."] }

Main Branch Tracking

If you intend to track Bevy's main branch, you can specify the latest commit you support in your Cargo.toml file:

bevy = { version = "0.4", git = "https://github.com/bevyengine/bevy", rev="509b138e8fa3ea250393de40c33cc857c72134d3", default-features = false }

You can specify the dependency both as a version and with git, the version will be used if using the dependency from crates.io, the git dependency will be used otherwise.

Bevy is evolving very fast. You can use one of these badges to communicate to your users how closely you intend to track Bevy's main branch.

badge
description
 code
Bevy tracking I intend to track main as much as I can [![Bevy tracking](https://img.shields.io/badge/Bevy%20tracking-main-lightblue)](https://github.com/bevyengine/bevy/blob/main/docs/plugins_guidelines.md#main-branch-tracking)
Bevy tracking I will only follow released Bevy versions [![Bevy tracking](https://img.shields.io/badge/Bevy%20tracking-released%20version-lightblue)](https://github.com/bevyengine/bevy/blob/main/docs/plugins_guidelines.md#main-branch-tracking)

General Advices for a Rust Crate

This advice is valid for any Rust crate.

Licensing

Bevy is dual licensed under MIT or Apache 2.0, at your option. Most other Rust projects (including Rust itself) also use this dual-license approach. MIT-only is very popular and you might be tempted to just use that (Bevy also used to be MIT-only), but there are very good reasons to include both and we highly recommend using the dual MIT / Apache-2.0 license for your Bevy Plugins and crates:

  • Including the Apache 2.0 license option significantly reduces the difficulty and boilerplate of proper license compliance in published games because you only need to include one copy of the Apache 2.0 license.
  • Provides maximum compatibility with Bevy and Rust, making it easier to upstream your changes.

Small Crate Size

To avoid long build times in your crate and in projects using your plugin, you should aim for a small crate size:

  • Disable Bevy features that you don't use
  • Avoid large dependencies
  • Put optional functionality and dependencies behind a feature

Documentation and Examples

Documentation and examples are very useful for a crate.

In the case of a plugin for Bevy, a few screenshots or movies/animated GIFs from your examples can really help understanding what your plugin can do.

Additionally, it can be helpful to list:

  • Stages added by the plugin
  • Systems used
  • New components available

Tests and CI

Tests are always good! For CI, you can check this example for a quickstart using GitHub Actions. As Bevy has additional Linux dependencies, you should install them before building your project, here is how Bevy is doing it. Even if you don't have many (or any) tests, setting up CI will compile check your plugin and ensure a basic level of quality.

Publishing your Plugin

There are some extra fields that you can add to your Cargo.toml manifest, in the [package] section:

field description
description a description of the plugin
repository URL of the plugin source repository
license the plugin license
keywords keywords for the plugin - "bevy" at least is a good idea here
categories categories of the plugin - see the full list on crates.io
exclude files to exclude from the released package - excluding the assets folder that you may have is a good idea, as well as any large file that are not needed by the plugin

Once a crate is published to crates.io, there are two badges that you can add to your README.md for easy links:

badge code
crates.io [![crates.io](https://img.shields.io/crates/v/bevy_awesome_plugin)](https://crates.io/crates/bevy_awesome_plugin)
docs.rs [![docs.rs](https://docs.rs/bevy_awesome_plugin/badge.svg)](https://docs.rs/bevy_awesome_plugin)